JP2009163817A - Data reproducing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To repair data which requires retries for playback and store them, so that no retry is required in the next playback. <P>SOLUTION: A data reproducing system has a non volatile memory in addition to a memory for data processing, accumulates data excluding the data whose error cannot be corrected and an error correction code when there are data whose error cannot be corrected, combines the accumulated data with read data for repair and stores the error-corrected data of a sector which has failed in identification address matching and the error correction code into the non volatile memory, so that data can be reproduced without retry even when error cannot be corrected while reproducing the data of an optical disk later. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a data reproducing apparatus.

  As background art of this technical field, for example, there is JP-A-2003-173633. In this publication, “when error correction processing is impossible for data that has been read once, for example, in a data block that has been read by retrying a data block that has been temporarily stored in storage means, By creating a new data block by overwriting sector data, codeword rows, and codeword strings that do not contain error data, it is possible to eliminate error data in the data block. Even if the data could not be completely removed, by performing error correction processing on the new data block, the probability that the remaining error data is corrected is improved, and the data unrecoverable rate can be reduced. It is possible to reduce the number of re-read processes by retry. "

JP 2003-173633 A

  Representative examples of optical disks include CDs (Compact Discs) and DVDs (Digital Versatile Discs). CD-Rs, CD-RWs, DVD-RAMs, DVD-Rs, DVD-RWs, etc., which can record these optical disks. There is. In these optical disk reproducing apparatuses, SRAM (Static RAM) and DRAM (Dynamic RAM) are used as data error correction memory and buffer memory.

  For example, in a DVD, an error correction code is added in the following units, and this error correction is performed on a memory. The error correction code employed in DVD is CIRC (Cross Interleaved Reed-Solomon Code) also used in CD, DAT, etc., and is high due to inner code parity PI (Parity Inner) and outer code parity PO (Parity Outer). Has error correction capability. The data is divided into 1-byte units, an identification address and an error detection code EDC (Error Detection Code) are added to form sectors, and 16 sectors are collected to form a matrix. A PO code which is a correction code is added, and a PI code which is a first error correction code is added to the data in the row direction and the PO code. One sector has 2 kbytes of data, and one processing block is composed of 16 sectors (32 kbytes) of data and error correction codes PI and PO.

  During DVD reproduction, data is stored in a memory together with an error correction code, and error correction is performed for each of the PI series and PO series. After error correction is completed, the data is unscrambled and output. However, if error correction is impossible in the processing block, data re-read processing called retry is performed, and data reproduction is attempted again.

  However, if the error correction cannot be solved even after repeated retries and the data reproduction is not completed within a predetermined time, the data reproduction is abandoned and an error code is sent.

  In Japanese Patent Laid-Open No. 2003-173633, when error correction processing is impossible, the EDC processing result of each sector of the data block temporarily stored in the storage unit and the data block read by retry is determined. The error data in the data block is removed by creating a new data block leaving only the sector without an EDC error. This makes it possible to reproduce data in which general error correction is impossible, but in data in which error correction is impossible due to out-of-track, data out of track and out-of-track data are mixed in the data block, Even if there is no EDC error, data with different identification addresses may exist. Therefore, data with different identification addresses cannot be removed only by discrimination based on the EDC processing result.

  SUMMARY OF THE INVENTION An object of the present invention is to enable data reproduction even when error correction cannot be performed due to out of track or out of focus.

  As an example, the above object can be achieved by restoring and storing data that cannot be reproduced unless retrying is repeated.

  According to the present invention, the number of retries during data reproduction can be reduced.

  Hereinafter, an embodiment in which the present invention is applied to a DVD playback apparatus will be described. Note that when not specifically mentioned in the following description, the time of reproduction means the time when the reproduction apparatus is operating in response to a reproduction command from the host.

  FIG. 1 is a block diagram showing the configuration of a DVD playback apparatus according to the first embodiment of the present invention. Reference numeral 1 denotes an optical disk. An optical pickup 2 reads a signal from the optical disc 1 and sends it to the AFE 3. Reference numeral 3 denotes an AFE (Analog Front End), which amplifies a reproduction signal read from the optical disc 1 via the optical pickup 2. Reference numeral 4 denotes a demodulation circuit, which binarizes the input signal, demodulates it to 8/16, and writes it to the DRAM 5. A DRAM 5 is used as an error correction memory or a buffer memory. An error correction circuit 6 reads data from the DRAM 5, corrects the error, writes it in the DRAM 5, and performs EDC operation on the data subjected to the error correction processing. A descrambling circuit 7 unscrambles the data for which error correction has been completed and sends it to the ATAPI circuit 8. Reference numeral 8 denotes an ATAPI circuit which sends data sent from the descrambling circuit 7 to the host computer. A non-volatile memory 9 stores data after error correction. In addition, the stored data is written in the corresponding part of the DRAM 5.

  When reproducing data from a DVD, the reproduction signal read from the optical disk 1 via the optical pickup 2 is first amplified by the AFE 3, then binarized by the demodulation circuit 4, 8/16 demodulated, and stored in the DRAM 5. . Next, the error correction circuit 6 performs error correction and EDC operation on the data stored in the DRAM 5. Then, the error-corrected data is sent to the descramble circuit 7 to be scrambled and output to the host computer via the ATAPI circuit 8.

  If error correction is impossible in the error correction circuit 6, all the sectors including the error correction code including only the sectors whose identification address matches the target address and whose EDC calculation result is correct are included in the DRAM 5 Copy to another area. If the error cannot be corrected again after retrying, if there is a sector corresponding to the data copied to another area in the DRAM 5 in the sector whose identification address or EDC operation result is not correct, the data of this sector is included. Instead, the error correction circuit 6 performs error correction. If the error correction error is resolved, the data is output to the host computer via the descrambling circuit 7 and the ATAPI circuit 8, and the error corrected data and the error correction code of the sector whose initial identification address does not match are output. It sends to the non-volatile memory 9.

  If the error correction failure has not been resolved, all the sectors including the error correction code, including the error correction code, are all stored in another area in the DRAM 5 in the data of the block in which the identification address matches the target address and the EDC operation result is correct. Retry is performed after copying, and if error correction is impossible again, if there is a sector corresponding to the data copied to another area in the DRAM 5 in a sector whose identification address or EDC operation result is incorrect, The error correction circuit 6 performs error correction instead of the sector data. If the error correction error is resolved, the data is output to the host computer via the descrambling circuit 7 and the ATAPI circuit 8, and the error corrected data and the error correction code of the sector whose initial identification address does not match are output. It sends to the non-volatile memory 9. This is performed until the error correction of data is eliminated.

  Copying to another area of the DRAM 5 only requires a sector whose identification address matches the target address and whose EDC operation result is correct, and there is no need to copy the already copied sector again.

  If error correction becomes impossible when the optical disk is reproduced next time, error correction is performed after the data in the nonvolatile memory 9 is copied to the corresponding part of the DRAM 5. Thereby, data reproduction can be performed without retrying.

(Note that when data is sent to the non-volatile memory 9, information specific to the disc such as the title is also sent, so that even if there are a plurality of optical discs that are incapable of error correction, the necessary data is correctly identified. be able to.)
FIG. 2 is a diagram for explaining the operation of error correction processing of the DVD playback apparatus according to the first embodiment of the present invention. The data read from the DVD for the first time and the data read for the second retry are connected and played back. The situation is drawn in a simplified block unit. This DVD has one scratch on several tracks, and it is assumed that the track is easily detached from the track. In the first time, since the track is removed at block N during reproduction, data in which block N and block N + 2 are mixed is stored in the DRAM. In this case, since error correction becomes impossible, retry is performed after copying only the data of the sector with the correct block N and EDC operation result and the error correction code to another area of the DRAM. In the retry, the track is removed from the block N-2 immediately before the reproduction of the block N and suddenly jumps into the block N, so only the data of the block N is stored in the DRAM. This data and the data of the block N copied to another area of the DRAM are connected to perform error correction.

  If the error correction failure is resolved, the data is output to the host computer, and the error-corrected data and error correction code of the sector whose initial identification address does not match are sent to the nonvolatile memory.

  If error correction is not resolved, block N and EDC operation result correct sector data and error correction code are copied to another area of DRAM and retry is performed. Connect to perform error correction. This is performed until the error correction of data is eliminated.

  FIG. 3 is a flowchart showing the read processing procedure of the DVD reproducing apparatus according to the first embodiment of the present invention.

  In the first N data read, N data is read from the DVD, stored in the DRAM, and error correction is performed. If the error correction result is uncorrectable, the data read is completed. If the error correction result is uncorrectable, the sector address and the error correction code in which the identification address matches the target address and the EDC operation result is correct are stored in another area in the DRAM. Evacuate to, then move to retry.

  In the retry, N data is read again from the DVD, stored in the DRAM, error correction is performed, and if the error correction result cannot be corrected, the error-corrected data and the error-corrected code of the sector whose initial identification address does not match are nonvolatile. Copy to memory and finish data read. If the correction is impossible, the data read from the DVD is connected to the data saved in another area in the DRAM, and error correction is performed again. If the error correction result is uncorrectable, the data after error correction and the error correction code of the sector whose initial identification address does not match are copied to the nonvolatile memory, and the data read is completed. If correction is impossible, the sector address and error correction code whose identification address matches the target address and whose EDC operation result is correct are saved in another area in the DRAM, and the process proceeds to retry. This is performed until the data read is completed.

  If error correction becomes impossible when the DVD is reproduced next time, the next N data read in FIG. 3 is performed. N data is read from the DVD and stored in the DRAM, and error correction is performed. If the correction is impossible, the data read from the nonvolatile memory is connected to the data read from the DVD, and the error correction is performed again. Thereby, data reproduction can be performed without retrying.

  With the above configuration, in the first embodiment of the present invention, when error correction is impossible, the data and error correction code of the sector whose identification address matches the target address and whose EDC calculation result is correct are stored in another area. Then, the accumulated data and the read data are connected and repaired, and the data after error correction and the error correction code of the sector whose initial identification address does not match are stored in the nonvolatile memory. Even if error correction becomes impossible during data reproduction, the data can be reproduced without retrying. Since no retry is necessary for the data, it is possible to prevent a decrease in the data reproduction speed, and for AV (Audio Visual) data with a limited number of retries to prevent video freeze, data reproduction is not in time. It is possible to prevent the occurrence of block noise lacking.

  FIG. 4 is a block diagram showing the configuration of a DVD playback apparatus according to the second embodiment of the present invention. The description of the same components as those in FIG. 1 is omitted. Reference numeral 11 denotes a recordable optical disc. An optical pickup 12 reads a signal from the optical disk 11 and sends it to the AFE 3. Further, the 8/16 modulation signal sent from the modulation circuit 14 is recorded on the optical disk 11. A modulation circuit 14 modulates the data and error correction code sent from the DRAM 15 by 8/16 and sends them to the optical pickup 12. A DRAM 15 is used as an error correction memory or a buffer memory.

  When reproducing data from a DVD, a reproduction signal read from the optical disk 11 via the optical pickup 12 is first amplified by the AFE 3, then binarized by the demodulation circuit 4, 8/16 demodulated, and stored in the DRAM 15. . Next, the error correction circuit 6 performs error correction on the data stored in the DRAM 15. Then, the error-corrected data is sent to the descramble circuit 7 to be scrambled and output to the host computer via the ATAPI circuit 8.

  If error correction is impossible in the error correction circuit 6, all the sectors including the error correction code including only the sectors whose identification address matches the target address and whose EDC calculation result is correct are included in the DRAM 5 Copy to another area. If the error cannot be corrected again after retrying, if there is a sector corresponding to the data copied to another area in the DRAM 5 in the sector whose identification address or EDC operation result is not correct, the data of this sector is included. Instead, the error correction circuit 6 performs error correction. Here, when the inability to correct the error is resolved, the data is output to the host computer via the descramble circuit 7 and the ATAPI circuit 8, and the data and the error correction code are 8/16 modulated by the modulation circuit 14, and the optical pickup 12 is recorded on the optical disc 11 in a predetermined unit.

  If the error correction failure has not been resolved, all the sectors including the error correction code, including the error correction code, are all stored in another area in the DRAM 5 in the data of the block in which the identification address matches the target address and the EDC operation result is correct. Retry is performed after copying, and if error correction is impossible again, if there is a sector corresponding to the data copied to another area in the DRAM 5 in a sector whose identification address or EDC operation result is incorrect, The error correction circuit 6 performs error correction instead of the sector data. If the error correction error is resolved, the data is output to the host computer via the descrambling circuit 7 and the ATAPI circuit 8, and the error corrected data and the error correction code of the sector whose initial identification address does not match are output. 8/16 modulation is performed by the modulation circuit 14, and recording is performed on the optical disk 11 in a predetermined unit via the optical pickup 12. This is performed until the error correction of data is eliminated.

  With the above configuration, in the second embodiment of the present invention, when error correction is impossible, the data and error correction code of the sector whose identification address matches the target address and whose EDC calculation result is correct are stored in another area. Then, the accumulated data and the read data are connected and repaired, and the data after error correction and the error correction code of the sector whose initial identification address does not match are 8/16 modulated and recorded on the optical disc. Data can be reproduced without retrying the data on the optical disc. Since no retry is necessary for the data, it is possible to prevent a decrease in the data reproduction speed, and for AV (Audio Visual) data with a limited number of retries to prevent video freeze, data reproduction is not in time. It is possible to prevent the occurrence of block noise lacking.

  FIG. 5 is an operation explanatory diagram of the error correction processing of the DVD reproducing apparatus according to the third embodiment of the present invention. Similarly to FIG. 2, the data read from the DVD for the first time and the data read by the second retry are shown. It is a simplified depiction of blocks that are joined together for playback. This DVD has one scratch on several tracks, and it is assumed that this scratch is easy to come off on the inner peripheral side of the track. In the first time, since the track is removed at the block N during reproduction, data in which the block N and the block N-2 are mixed is stored in the DRAM. In this case, since error correction becomes impossible, retry is performed after copying only the data of the sector with the correct block N and EDC operation result and the error correction code to another area of the DRAM. Since it tends to come off to the inner circumference side of the track, even if it tries to read the data of the block N, it comes off before reaching the block N. Therefore, in the retry, the block N + 2 on the outer periphery side of the block N is reproduced. Since the track has come off at block N + 2 and jumped into block N, data in which block N + 2 and block N are mixed is stored in the DRAM. This data and the data of the block N copied to another area of the DRAM are connected to perform error correction.

  If the error correction failure is resolved, the data is output to the host computer, and the error-corrected data and error correction code of the sector whose initial identification address does not match are sent to the nonvolatile memory.

  If error correction is not resolved, block N and EDC operation result correct sector data and error correction code are copied to another area of DRAM and retry is performed. Connect to perform error correction. This is performed until the error correction of data is eliminated.

  Note that it is possible to determine which side of the track is likely to come off based on the transition of the reproduction address of the relevant part of the DVD or the identification address of the data stored in the DRAM. Whether to replay the target block or the block of the adjacent track at the time of retrying can be determined based on whether the necessary data is on the front side or the back side of the flaw. If the necessary data is on the front side of the flaw, the target block should be reproduced, and if it is on the rear side, the block of the adjacent track should be reproduced.

  FIG. 6 is a flowchart showing the read processing procedure of the DVD playback apparatus according to the third embodiment of the present invention.

  In the first N data read, N data is read from the DVD, stored in the DRAM, and error correction is performed. If the error correction result is uncorrectable, the data read is completed. If the error correction result is uncorrectable, the sector address and the error correction code in which the identification address matches the target address and the EDC operation result is correct are stored in another area in the DRAM. If an address different from the target identification address is detected after the scratch, the difference M between the target address N and the non-matching address is stored and then the process proceeds to special retry. If an address different from the target identification address is not detected, or if it is detected but before a flaw, the routine proceeds to the normal retry shown in FIG.

  In the special retry, N + M data is read from the DVD, stored in the DRAM, and error correction is performed. If the error correction result is not uncorrectable and N data, the identification address does not match and the sector data and error correction code that can be reproduced for the first time by special retry are copied to the nonvolatile memory, and the data read is terminated. If it is neither correctable nor N data, the process returns to the first N data read. If correction is impossible, the data saved in another area in the DRAM is copied and connected to this data, and error correction is performed again. If the error correction result is not uncorrectable, the data of the sector and the error correction code that have been reproduced for the first time by special retry due to the mismatch of the identification address are copied to the nonvolatile memory, and the data read is completed. If correction is impossible, the sector address and the error correction code in which the identification address matches the target identification address and the EDC operation result is correct are saved in another area in the DRAM, and the process proceeds to special retry again. This is performed until the data read is completed.

  If error correction becomes impossible when the DVD is reproduced next time, the next N data read in FIG. 3 is performed. N data is read from the DVD and stored in the DRAM, and error correction is performed. If the correction is impossible, the data read from the nonvolatile memory is connected to the data read from the DVD, and the error correction is performed again. Thereby, data reproduction can be performed without retrying.

  In this embodiment, when an address different from the target identification address is detected after a flaw, the process shifts to a special retry. However, the flaw detection is not essential, and the identification address of DRAM storage data is changed. It is irrelevant whether a flaw is detected or not. When an address different from the target identification address is detected in the middle of the block of DRAM stored data, the special retry may be performed.

  With the above configuration, in the third embodiment of the present invention, similarly to the first embodiment, when error correction is impossible, the identification address matches the target address and the EDC operation result is the correct sector data and The error correction code is accumulated in a separate area, and the accumulated data and the read data are connected and repaired. The data after error correction and the error correction code of the sector whose initial identification address does not match are stored in the nonvolatile memory. Therefore, even if error correction becomes impossible at the next reproduction of the data on the optical disc, the data can be reproduced without retrying.

  Further, in the third embodiment, not only the target block is reproduced at the time of retry, but also the target data is reproduced by reproducing the block of the adjacent track as necessary, even if it is likely to jump to either side of the track due to scratches or the like. Can be stored.

  FIG. 7 is a flowchart showing the read processing procedure of the DVD playback apparatus according to the fourth embodiment of the present invention.

  In the first N data read, N data is read from the DVD, stored in the DRAM, and error correction is performed. If the error correction result cannot be corrected, the data read is completed. If the error correction result cannot be corrected, the data and error correction code of the sector in which the identification address matches the target identification address and the EDC operation result is correct are stored in the DRAM. Move to retry after saving to the area.

  In retry, N data is read again from the DVD, stored in DRAM, and error correction is performed. If the error correction result cannot be corrected, the identification address matches the target address and the EDC operation result is correct only once. The data after error correction of the sector and the error correction code are copied to the nonvolatile memory, and the data read is completed.

If the correction is impossible, the data read from the DVD is connected to the data saved in another area in the DRAM, and error correction is performed again. If the error correction result is not uncorrectable, the error corrected code and the error correction code of the sector whose identification address matches the target address and the EDC operation result is correct only once are copied to the nonvolatile memory. End data read. If correction is impossible, the sector address and error correction code of the sector whose identification address matches the target address and whose EDC calculation result is correct are saved in another area in the DRAM, and the process proceeds to retry. This is performed until the data read is completed.
If error correction becomes impossible when the DVD is played next time, the next N data read in FIG. 7 is performed. N data is read from the DVD and stored in the DRAM, and error correction is performed. If the correction is impossible, the data read from the nonvolatile memory is connected to the data read from the DVD, and the error correction is performed again. Thereby, data reproduction can be performed without retrying.
With the above configuration, in the fourth embodiment of the present invention, when error correction is impossible, sector data and error correction code whose identification address matches the target address and whose EDC operation result is correct are stored in another area. Then, the accumulated data and the read data are connected and restored, and the error corrected code and the error correction code of the sector whose identification address matches the target address and the EDC operation result is correct only once Is stored in the non-volatile memory, the data can be reproduced without retrying even if error correction becomes impossible the next time the data on the optical disk is reproduced.

  In the first embodiment, since the data after error correction and the error correction code of the sector that initially did not match the identification address are stored in the nonvolatile memory, the data of the sector that is unlikely to be reproduced can be read out for the first time. In this case, this data cannot be stored in the nonvolatile memory. However, in the fourth embodiment, after the error correction of the sector in which the identification address matches the target address and the EDC operation result is correct only once. Since the data and the error correction code are stored in the non-volatile memory, the data of the sector having a low possibility of being read can be stored in the non-volatile memory.

  Note that since the purpose is to store data of a sector that is unlikely to be reproduced in the nonvolatile memory, the number of determinations to be stored in the nonvolatile memory is not particularly limited to one, and may be any number.

  FIG. 8 is an explanatory diagram of the error correction operation of the DVD reproducing apparatus according to the fifth embodiment of the present invention, in which the data read from the first time and the data read by the second retry are connected and reproduced from the multilayer DVD. The situation is drawn in a simplified block unit. This DVD has L, N, and P layers, but there is one scratch, and it is assumed that the focus is easily lost due to this scratch. At the first time, since the focus is lost in the block N during reproduction and the data is drawn into the L layer, data in which the block N and the block L are mixed is stored in the DRAM. In this case, since error correction becomes impossible, retry is performed after copying only the data of the sector with the correct block N and EDC operation result and the error correction code to another area of the DRAM. Since the focus is easily deviated in the direction of the L layer, when the data of the block N is to be read, the focus is deviated and pulled into the L layer. Therefore, in the retry, the block P of the P layer opposite to the L layer across the N layer is reproduced. Since the focus is lost at block P and jumped into block N, data in which block P and block N are mixed is stored in the DRAM. This data and the data of the block N copied to another area of the DRAM are connected to perform error correction.

  If the error correction failure is resolved, the data is output to the host computer, and the error-corrected data and error correction code of the sector whose initial identification address does not match are sent to the nonvolatile memory.

  If error correction is not resolved, block N and EDC operation result correct sector data and error correction code are copied to another area of DRAM and retry is performed. Connect to perform error correction. This is performed until the error correction of data is eliminated.

  With the above configuration, in the fifth embodiment of the present invention, similarly to the first embodiment, when error correction is impossible, the identification address matches the target address, and the EDC operation result is the correct sector data and The error correction code is accumulated in a separate area, and the accumulated data and the read data are connected and repaired. The data after error correction and the error correction code of the sector whose initial identification address does not match are stored in the nonvolatile memory. Therefore, even if error correction becomes impossible at the next reproduction of the data on the optical disc, the data can be reproduced without retrying.

  Furthermore, in the fifth embodiment, not only the target block is reproduced at the time of retry, but also the data of the adjacent layer is reproduced as necessary, thereby storing the target data even when the focus is likely to fly due to scratches or the like. be able to.

  In each of the above embodiments, the case where the present invention is applied to a DVD reproducing apparatus has been described as an example. However, the present invention can be applied to a DVD recording / reproducing apparatus, and the present invention is limited to each of the above embodiments. However, the present invention can be variously modified and implemented without departing from the spirit of the invention.

It is a block diagram which shows the structure of the DVD reproducing | regenerating apparatus of a 1st Example. It is operation | movement explanatory drawing of the error correction process of the DVD reproducing | regenerating apparatus of 1st Example. It is a flowchart which shows the read-processing procedure of the DVD reproducing | regenerating apparatus of a 1st Example. It is a block diagram which shows the structure of the DVD reproducing | regenerating apparatus of a 2nd Example. It is operation | movement explanatory drawing of the error correction process of the DVD reproducing | regenerating apparatus of a 3rd Example. It is a flowchart which shows the read processing procedure of the DVD reproducing | regenerating apparatus of a 3rd Example. It is a flowchart which shows the read processing procedure of the DVD reproducing | regenerating apparatus of a 4th Example. It is explanatory drawing which shows the error correction process of the DVD reproducing | regenerating apparatus of a 5th Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Optical pick-up, 3 ... AFE, 4 ... Demodulation circuit, 5 ... DRAM, 6 ... Error correction circuit, 7 ... Descramble circuit, 8 ... ATAPI, 9 ... Non-volatile memory, 11 ... Optical disk, 12 ... Optical pickup, 14 ... modulation circuit, 15 ... DRAM

Claims (5)

A data reproduction device that reads data from a recording medium recorded with an error correction code and records the error based on a reproduction command from the host, performs error correction, and outputs the data.
First storage means for temporarily storing data;
Error correction means for performing error correction of data stored in the first storage means;
Second storage means for storing data error-corrected by the error correction means;
With
When error correction is impossible in the error correction means, data whose identification address mismatch is resolved is transferred from the first storage means to the second storage means among the data in which the error correction inability is eliminated by re-reading. Remember,
If error correction is impossible when reproducing data next time, the data stored in the second storage means is transferred to the first storage means;
Data playback device. A data reproduction device that reads data from a recording medium recorded with an error correction code and records the error based on a reproduction command from the host, performs error correction, and outputs the data.
First storage means for temporarily storing data;
Error correction means for performing error correction of data stored in the first storage means;
Recording means for recording the data corrected by the error correction means on a recording medium;
With
When error correction is impossible in the error correction means, among the data in which the error correction inability has been eliminated by re-reading, the data in which the identification address mismatch has been eliminated is recorded on a recording medium in a predetermined unit.
Data playback device. The data reproducing apparatus according to claim 1, wherein
When error correction is impossible in the error correction means, and identification address mismatch occurs from the middle of the error correction block, the data of the adjacent track is read instead of the target data at the time of reading again, and the identification address mismatch is resolved by this reading. Transferring and storing data from the first storage means to the second storage means;
If error correction is impossible when reproducing data next time, the data stored in the second storage means is transferred to the first storage means;
Data playback device. The data reproducing apparatus according to claim 1, wherein
In the case where error correction is impossible in the error correction means, data having a small number of times that error correction cannot be corrected and identification address mismatch is resolved by rereading is transferred from the first storage means to the second storage means, and stored.
If error correction is impossible when reproducing data next time, the data stored in the second storage means is transferred to the first storage means;
Data playback device. The data reproducing apparatus according to claim 1, wherein
When error correction is impossible in the error correction means, and identification address mismatch occurs from the middle of the error correction block, the data of the adjacent layer is read instead of the target data at the time of reading again, and the identification address mismatch is resolved by the reading again. Transferring and storing data from the first storage means to the second storage means;
If error correction is impossible when reproducing data next time, the data stored in the second storage means is transferred to the first storage means;
Data playback device.

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